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Sep 23, 2013
09/13

by
Damien Challet; Matteo Marsili

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We show that the Minority Game, a model of interacting heterogeneous agents, can be described as a spin systems and it displays a phase transition between a symmetric phase and a symmetry broken phase where the games outcome is predicable. As a result a ``spontaneous magnetization'' arises in the spin formalism.

Source: http://arxiv.org/abs/cond-mat/9904071v2

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Sep 21, 2013
09/13

by
W. N. Kang; Wan-Seon Kim; S. J. Oh; Sung-Ik Lee; D. H. Kim; C. H. Choi; H. -C. Ri; C. W. Chu

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The mixed-state Hall resistivity and the longitudinal resistivity in HgBa_{2}CaCu_{2}O_{6}, HgBa_{2}Ca_{2}Cu_{3}O_{8}, and Tl_{2}Ba_{2}CaCu_{2}O_{8} thin films have been investigated as functions of the magnetic field up to 18 T. We observe the universal scaling behavior between \rho_{xy} and \rho_{xx} in the regions of the clean and the moderately clean limit. The scaling exponent \beta is 1.9 in the clean limit at high field and low temperature whereas \beta is 1.0 in the moderately clean...

Source: http://arxiv.org/abs/cond-mat/9905201v1

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Jul 20, 2013
07/13

by
Brien C. Nolan

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Examples of space-times are given which contain scalar curvature singularities whereat the metric tensor is regular and continuous, but which are gravitationally strong. Thus the argument that such singularities are necessarily weak is incomplete; in particular the question of the gravitational strength of the null Cauchy horizon singularity which occurs in gravitational collapse remains open.

Source: http://arxiv.org/abs/gr-qc/9902020v1

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Sep 18, 2013
09/13

by
Borut Bajc; Goran Senjanovic

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We show that the natural presence of flat directions in supersymmetric theories allows for nonrestoration of global and/or gauge symmetries. This has important cosmological consequences for supersymmetric GUTs and in particular it offers a solution of the monopole problem.

Source: http://arxiv.org/abs/hep-ph/9811321v2

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Sep 18, 2013
09/13

by
Markus A. Luty; John Terning

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We review recent work on realistic models that break supersymmetry dynamically and give rise to composite quarks and leptons, all in a single sector. These models have a completely natural suppression of flavor-changing neutral currents, and the hierarchy of Yukawa couplings is explained by the dimensionality of composite states. The generic signatures are unification of scalar masses with different quantum numbers at the compositeness scale, and lighter gaugino, Higgsino, and third-generation...

Source: http://arxiv.org/abs/hep-ph/9903393v1

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Sep 21, 2013
09/13

by
R. Kamiński; L. Leśniak; B. Loiseau

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Properties of scalar--isoscalar mesons in a mass range from pi-pi threshold up to 1800 MeV are analysed using an unitary model with separable interactions in three decay channels: pi-pi, K-anti K and an effective 2pi-2pi. Different solutions are obtained by fitting pi-pi and K-anti K data. Analytical structure of the meson-meson multichannel amplitudes is studied with a special emphasis on the important role played by the S-matrix zeroes. The dependence of the positions of S-matrix...

Source: http://arxiv.org/abs/hep-ph/9905234v1

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Sep 18, 2013
09/13

by
M. V. Cougo-Pinto; C. Farina; M. R. Negrao; A. C. Tort

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We compute the influence of boundary conditions on the Euler-Heisenberg effective Lagrangian scalar QED scalar for the case of a pure magnetic field. The boundary conditions constrain the quantum scalar field to vanish on two parallel planes separeted by a distance $a$ and the magnetic field is assumed to be constant, uniform and perpendicular to the planes. The effective Lagrangian is obtained using Schwinger's proper-time representation and exhibits new contributions generated by the boundary...

Source: http://arxiv.org/abs/hep-th/9809216v2

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Sep 19, 2013
09/13

by
Roberto Iengo; Chuan-Jie Zhu

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We reanalyse the computation of the cosmological constant $\Lambda$ at two loops in recently proposed Superstring models without massless gravitini, both in the theta-function based formalism and by a detailed computation in the more explicit hyperelliptic description of the underlying genus two Riemann surface. $\Lambda$ is expressed as the integral over the surface moduli of an amplitude which is zero if susy is not completely broken, but we find it to be nonvanishing in the susy breaking...

Source: http://arxiv.org/abs/hep-th/9912074v1

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Jul 20, 2013
07/13

by
Miloslav Znojil

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Schroedinger equation H \psi=E \psi with PT - symmetric differential operator H=H(x) = p^2 + a x^4 + i \beta x^3 +c x^2+i \delta x = H^*(-x) on L_2(-\infty,\infty) is re-arranged as a linear algebraic diagonalization at a>0. The proof of this non-variational construction is given. Our Taylor series form of \psi complements and completes the recent terminating solutions as obtained for certain couplings \delta at the less common negative a.

Source: http://arxiv.org/abs/quant-ph/9906029v2

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Sep 21, 2013
09/13

by
R. D. Pisarski; D. H. Rischke

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Because of a logarithmic enhancement from soft, collinear magnetic gluons, in dense quark matter the gap for a color superconducting condensate with spin zero depends upon the QCD coupling constant g not as exp(-1/g^2), like in BCS theory, but as exp(-1/g). In weak coupling, the ratio of the transition temperature to the spin-zero gap at zero temperature is the same as in BCS theory. We classify the gaps with spin one, and find that they are of the same order in g as the spin-zero gap.

Source: http://arxiv.org/abs/nucl-th/9907041v3

This paper describes the outcomes of 11 California pilot projects designed to return students with disabilities to public education. A total of 220 students with severe disabilities who had been previously placed in private sites were selected to participate based on class communication between the public and private settings. Service delivery models varied from site to site and included merging reintegrated students into existing special education classes, development of new classrooms at a...

Topics: ERIC Archive, Cost Effectiveness, Delivery Systems, Educational Attainment, Educational...

Prompted by the prediction of Cohen and coworkers that beta carbon nitride may have properties similar to diamond, there have been many attempts to synthesize this hypothetical metastable material. We successfully synthesized this material via epitaxial stabilization using TiN(111) and ZrN(111) as the growth template. The coatings were CN/TiN or CN/ZrN multilayers grown in a dual-magnetron system. The existence of beta carbon nitride in these multilayers has been confirmed with cross-section...

Topics: DTIC Archive, Chung, Yip-Wah, NORTHWESTERN UNIV EVANSTON IL, *CARBON, *NITRIDES, COMPOSITE...

Theoretical analysis of hypersonic boundary-layer receptivity to wall disturbances is conducted using a combination of asymptotic and numerical methods. Excitation of the second-mode waves by distributed and local forcing on the flat plate surface is studied under adiabatic and cooled wall conditions. Analysis addresses receptivity to wall vibrations, periodic suction-blowing through a hole or slot, and temperature disturbances. A strong excitation occurs in local regions where forcing is in...

Topics: DTIC Archive, Fedorov, Alexander V., MOSCOW INST OF PHYSICS AND TECHNOLOGY ZHUKOVKI (RUSSIA),...

This position paper offers a response to the National Assessment of Educational Progress's (NAEP) 1998 Civics Report Card to the nation. The paper lists the following major points: the NAEP findings are ground for concern, calling for action to remedy a serious deficiency in the education of citizens; failure of students to do well on the NAEP study is a direct consequence of the widespread lack of adequate curricular requirements, teacher preparation, and instruction in civics and government;...

Topics: ERIC Archive, Academic Achievement, Citizenship, Citizenship Education, Civics, Elementary...

At your request, we reviewed DOD's management of various Year 2000- related end-to-end testing activities. As part of our efforts, we assessed the U.S. Space Command's management of its end-to-end test of space control systems essential to major theater war (one of 16 operational evaluations for the command) and determined what the results of this test show with respect to operational risks and readiness. We briefed Space Command officials on our findings on October 1,1999, and made a...

Topics: DTIC Archive, GENERAL ACCOUNTING OFFICE WASHINGTON DC ACCOUNTING AND INFORMATION MANAGEMENT DIV,...

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Sep 23, 2013
09/13

by
G. A. Kriss; A. F. Davidsen; W. Zheng; G. Lee

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We present absolutely calibrated FUV spectra of the quasar 3C~273 covering 900- 1800 A. Our ~3 A resolution spectra were obtained with the Hopkins Ultraviolet Telescope during the Astro-1 mission in December 1990 and during the Astro-2 mission in March 1995. Both spectra exhibit a change in slope near the Lyman limit in the quasar rest frame. At longer UV wavelengths, the continuum has a power-law index of 0.5-0.7, while shortward of the Lyman limit it is 1.2-1.7. The energy distribution in...

Source: http://arxiv.org/abs/astro-ph/9909053v1

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Sep 23, 2013
09/13

by
W. Herbst; K. L. Rhode; L. A. Hillenbrand; G. Curran

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Eighteen fields in the Orion Nebula Cluster (ONC) have been monitored for one or more observing seasons from 1990-99 with a 0.6-m telescope at Wesleyan University. Photometric data were obtained in Cousins I on 25-40 nights per season. Results from the first 3 years of monitoring were analyzed by Choi & Herbst (1996; CH). Here we provide an update based on 6 more years of observation and the extensive optical and IR study of the ONC by Hillenbrand (1997) and Hillenbrand et al. (1998)....

Source: http://arxiv.org/abs/astro-ph/9909427v1

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Sep 23, 2013
09/13

by
Rien van de Weygaert; Yehuda Hoffman

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Unlike the substantial coherent bulk motion in which our local patch of the Cosmos is participating, the amplitude of the random motions around this large scale flow seems to be surprisingly low. Attempts to invoke global explanations to account for this coldness of the local cosmic velocity field have not yet been succesfull. Here we propose a different view on this cosmic dilemma, stressing the repercussions of our cosmic neighbourhood embodying a rather uncharacteristic region of the Cosmos....

Source: http://arxiv.org/abs/astro-ph/9909103v1

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Sep 19, 2013
09/13

by
Oliver Schoenborn; Rashmi C. Desai

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We show how the interface curvature autocorrelation function (ICAF) and associated structure factor (ICSF), of relevance in non-equilibrium pattern-formation problems where sharp interfaces are present, provide new and interesting information on domain structure, as yet not visible via the order-parameter structure factor (OPSF). This is done by discussing numerical simulations of model A (non-conserved relaxational phase-ordering kinetics) in two-dimensional systems. The ICAF is Gaussian over...

Source: http://arxiv.org/abs/cond-mat/9804236v2

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Jul 20, 2013
07/13

by
Benjamin P. Lee; Jack F. Douglas; Sharon C. Glotzer

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The influence of immobile filler particles (spheres, fibers, platelets) on polymer blend phase separation is investigated computationally using a generalization of the Cahn-Hilliard-Cook (CHC) model. Simulation shows that the selective affinity of one of the polymers for the filler surface leads to the development of concentration waves about the filler particles at an early stage of phase separation in near critical composition blends. These "target" patterns are overtaken in late...

Source: http://arxiv.org/abs/cond-mat/9906111v1

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Sep 21, 2013
09/13

by
Alexander I. Olemskoi; Valerii A. Brazhnyi

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The effective motion equation that describes the different monomer alternation along the heteropolymer chain is proposed. On its basis the supersymmetry field scheme that allows to obtain the equations for the structure factor and Green function is built up. The memory and ergodicity breaking effects are investigated depending on the temperature and quenched disorder of the monomer alternation. The phase diagram that determines the existence of the non-ergodic and freezing states is provided.

Source: http://arxiv.org/abs/cond-mat/9907398v1

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Sep 23, 2013
09/13

by
Klaus Altmann; Duco van Straten

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We prove a vanishing theorem for the Hodge number h^21 of projective toric varieties provided by a certain class of polytopes. We explain how this Hodge number also gives information about the deformation theory of the toric Gorenstein singularity derived from the same polytope. In particular, the vanishing theorem for h^21 implies that these deformations are unobstructed.

Source: http://arxiv.org/abs/math/9904034v1

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Jul 20, 2013
07/13

by
Ralph Greenberg; Vinayak Vatsal

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Let p be an odd prime. Suppose that E is a modular elliptic curve/Q with good ordinary reduction at p. Let Q_{oo} denote the cyclotomic Z_p-extension of Q. It is conjectured that Sel_E(Q_{oo}) is a cotorsion Lambda-module and that its characteristic ideal is related to the p-adic L-function associated to E. Under certain hypotheses we prove that the validity of these conjectures is preserved by congruences between the Fourier expansions of the associated modular forms.

Source: http://arxiv.org/abs/math/9906215v1

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Sep 18, 2013
09/13

by
Hale V. Bradt

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The Rossi X-ray Timing Explorer (RXTE) satellite was launched on 30 December 1995. It has made substantial contributions pertaining to compact objects and their environs. Broad-band spectral and short-time-scale temporal studies are exploring the effects of General Relativity in the regime of strong gravity. We present a brief outline of the principal contributions and then give a general overview of two new areas of x-ray astronomy that have proven by RXTE to be very fruitful: accreting...

Source: http://arxiv.org/abs/astro-ph/9901174v1

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35

Sep 18, 2013
09/13

by
P. Butera; M. Comi

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We show how to compute the generating function of the self-avoiding polygons on a lattice by using the statistical mechanics Schwinger-Dyson equations for the correlation functions of the $N$-vector spin model on that lattice.

Source: http://arxiv.org/abs/cond-mat/9903297v1

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Sep 21, 2013
09/13

by
Sumathi Rao

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We give a brief introduction to Luttinger liquids and to the phenomena of electronic transport or conductance in quantum wires. We explain why the subject of transport in Luttinger liquids is relevant and fascinating and review some important results on tunneling through barriers in a one-dimensional quantum wire and the phenomena of persistent currents in mesoscopic rings. We give a brief description of our own work on transport through doubly-crossed Luttinger liquids and transport in the...

Source: http://arxiv.org/abs/cond-mat/9905049v1

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Sep 18, 2013
09/13

by
B. Abbott

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We report on a search for bottom squarks produced in pbarp collisions at sqrt(s) = 1.8 TeV using the D0 detector at Fermilab. Bottom squarks are assumed to be produced in pairs and to decay to the lightest supersymmetric particle (LSP) and a b quark with branching fraction of 100%. The LSP is assumed to be the lightest neutralino and stable. We set limits on the production cross section as a function of bottom squark mass and LSP mass.

Source: http://arxiv.org/abs/hep-ex/9903041v1

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Sep 18, 2013
09/13

by
B. G. Konopelchenko; G. Landolfi

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Generalized Weierstrass formulae for surfaces in four-dimensional space $\Bbb{R}^{4}$ are used to study (anti)self-dual rigid string configurations. It is shown that such configurations are given by superminimal immersions into $\Bbb{R}^{4}$. Explicit formulae for generic (anti)instantons are presented. Particular classes of surfaces are also analyzed.

Source: http://arxiv.org/abs/hep-th/9901113v1

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Sep 19, 2013
09/13

by
Igor Bandos; Jerzy Lukierski; Dmitri Sorokin

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We show that in the supersymmetry framework described by a Poincar\'{e} superalgebra with tensorial central charges the role of generalized superconformal symmetry which contains all these central charges is played by $OSp(1|2^{k})$, where k=3 for D=4. Following [1,2] we describe the free supertwistor model for $OSp(1|8)$. It appears that in such a scheme the tensorial central charges satisfy additional relations and the model describes the tower of supersymmetric massless states with an...

Source: http://arxiv.org/abs/hep-th/9912051v1

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Sep 21, 2013
09/13

by
Ricard V. Sole; Bartolo Luque; Stuart Kauffman

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The critical boundaries separating ordered from chaotic behavior in randomly wired S-state networks are calculated. These networks are a natural generalization of random Boolean nets and are proposed as on extended approach to genetic regulatory systems, sets of cells in different states or collectives of agents engaged into a set of S possible tasks. A order parameter for the transition is computed and analysed. The relevance of these networks to biology, their relationships with standard...

Source: http://arxiv.org/abs/adap-org/9907011v1

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Sep 21, 2013
09/13

by
S. Ida; J. D. Larwood; A. Burkert

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We have investigated effects of early stellar encounters on a protoplanetary disk (planetesimal disk) and found that they can explain the high eccentricities and inclinations observed in the outer part ($>42$AU) of the Edgeworth-Kuiper Belt (EKB). The proto-sun is considered as a member of a stellar aggregation that undergoes dissolution on a timescale $\sim 10^8$yrs, such that a planetesimal disk experiences a flyby encounter at pericenter distance ($q$) on the order of 100AU. We simulated...

Source: http://arxiv.org/abs/astro-ph/9907217v2

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Sep 23, 2013
09/13

by
Qingjuan Yu; Youjun Lu

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Previous calculations of Fe K-alpha line profiles are based on axisymmetric emissivity laws. In this paper, we show line profiles driven by non-axial symmetric illumination which results from an off-axis X-ray point source. We find that source location and motion have significant effects on the red wing and blue horn of the line profiles. The disk region under the source will receive more flux, which is the most important factor to affect the line profiles. We suggest that at least part of the...

Source: http://arxiv.org/abs/astro-ph/9908079v1

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Sep 23, 2013
09/13

by
W. N. Brandt; A. Comastri; S. C. Gallagher; R. M. Sambruna; Th. Boller; A. Laor

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We present results from a BeppoSAX observation of the BAL QSO CSO 755, observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX MECS, making it the highest redshift (z=2.88) and most optically luminous (M_V=-27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are only able to place loose constraints upon its X-ray spectral shape. Our X-ray...

Source: http://arxiv.org/abs/astro-ph/9909284v1

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Sep 19, 2013
09/13

by
Tobias Hertel; Gunnar Moos

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We have studied the dynamics of electrons in single wall carbon nanotubes using femtosecond time-resolved photoemission. The lifetime of electrons excited to the pi* bands is found to decrease continuously from 130 fs at 0.2 eV down to less than 20 fs at energies above 1.5 eV with respect to the Fermi level. This should lead to a significant lifetime--induced broadening of the characteristic van Hove singularities in the nanotube DOS.

Source: http://arxiv.org/abs/cond-mat/9911302v1

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Jul 20, 2013
07/13

by
Robert A. Wickham; Alan T. Dorsey

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We consider the effects of critical superconducting fluctuations on the scaling of the linear a.c. conductivity, \sigma(\omega), of a bulk superconductor slightly above Tc in zero applied magnetic field. The dynamic renormalization- group method is applied to the relaxational time-dependent Ginzburg-Landau model of superconductivity, with \sigma(\omega) calculated via the Kubo formula to O(\epsilon^{2}) in the \epsilon = 4 - d expansion. The critical dynamics are governed by the relaxational...

Source: http://arxiv.org/abs/cond-mat/9906124v1

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Sep 18, 2013
09/13

by
DELPHI Collaboration; P. Abreu et al

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A search for stable and long-lived heavy charged particles used the data taken by the DELPHI experiment at energies from 130 to 183 GeV. The Cherenkov light detected in the Ring Imaging Cherenkov Detector and the ionization loss measured in the Time Projection Chamber identify heavy particles from masses of 2 to nearly 89 GeV/c^2. Upper limits are given on the production cross-section and masses of sleptons, free squarks with a charge of $q = \pm 2/3e$ and hadronizing squarks.

Source: http://arxiv.org/abs/hep-ex/9811007v3

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Jul 20, 2013
07/13

by
S. P. Baranov; H. Jung; N. P. Zotov

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In the framework of semi-hard QCD approach, we present a consistent analysis of D^* meson production at HERA energies. The consideration is based on universal unintegrated gluon densities, which have BFKL behavior in the small x region. Predictions of the CCFM evolution equation for D^* production are obtained and show a good description of D^* data at HERA.

Source: http://arxiv.org/abs/hep-ph/9910210v1

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Sep 19, 2013
09/13

by
V. A. Kudryavtsev; E. V. Korolkova; N. J. C. Spooner

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We revise the process of muon pair production by high-energy muons in rock using the recently published cross-section. The three-dimensional Monte Carlo code MUSIC has been used to obtain the characteristics of the muon bundles initiated via this process. We have compared them with those of conventional muon bundles initiated in the atmosphere and shown that large underground detectors, capable of collecting hundreds of thousands of multiple muon events, can discriminate statistically muon...

Source: http://arxiv.org/abs/hep-ph/9911493v1

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Sep 23, 2013
09/13

by
Wilderich Tuschmann

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Our main result asserts that for any given numbers C and D the class of simply connected closed smooth manifolds of dimension m

Source: http://arxiv.org/abs/math/9908156v1

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Sep 19, 2013
09/13

by
Bas Edixhoven

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We prove, assuming the generalized Riemann hypothesis, the Andre-Oort conjecture for Hilbert modular surfaces. More precisely, let K be a real quadratic field and let S be the coarse moduli space of complex abelian surfaces with multiplications by the ring of integers of K. Let C be an irreducible closed curve in S, and suppose that C contains infinitely many complex multiplication points. Then we prove, assuming GRH, that C is of Hodge type, meaning, in this case, that it parametrizes abelian...

Source: http://arxiv.org/abs/math/9911272v1

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Jul 20, 2013
07/13

by
A. Puente; M. Casas; Ll. Serra

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A semiclassical Thomas-Fermi method, including a Weizs\"acker gradient term, is implemented to describe ground states of two dimensional nanostructures of arbitrary shape. Time dependent density oscillations are addressed in the same spirit using the corresponding semiclassical time-dependent equations. The validity of the approximations is tested, both for ground state and density oscillations, comparing with the available microscopic Kohn-Sham solutions.

Source: http://arxiv.org/abs/cond-mat/9910324v1

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Jul 20, 2013
07/13

by
Eric S. Perlman; Greg Madejski; John T. Stocke; Travis A. Rector

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We report on monitoring of the BL Lac object PKS 2005-489 by the Rossi X-ray Timing Explorer (RXTE) in October-December 1998. During these months, the source underwent a spectacular flare; at its peak on November 10, its 2-10 keV flux was $3.33 \times 10^{-10} {\rm ~erg ~cm^{-2} ~s^{-1}}$, over 30 times brighter than in quiescence. During the rising phase, the X-ray spectrum of PKS 2005-489 hardened considerably, reaching $\alpha = 1.32~ (F_\nu \propto \nu^{-\alpha})$ near maximum. During the...

Source: http://arxiv.org/abs/astro-ph/9906351v3

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Sep 19, 2013
09/13

by
Habib G. Khosroshahi; Yogesh Wadadekar; Ajit Kembhavi

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Using a two-dimensional galaxy image decomposition technique, we extract global bulge and disk parameters for a complete sample of early type disk galaxies in the near infrared K band. We find significant correlation of the bulge parameter n with the central bulge surface brightness $\mu_b(0)$ and with effective radius r_e. Using bivar iate analysis techniques, we find that $\log n$, $\log r_e$ and $\mu_b(0)$ are distributed in a plane with small scatter. We do not find a strong correlation of...

Source: http://arxiv.org/abs/astro-ph/9911402v1

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Apr 13, 2017
04/17

by
Co-operative Federation of Victoria Ltd

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Fourth Annual General Meeting Minute of Southern Energy Co-operative Ltd, Frankston, Victoria, Australia. Five members were in attendance.

Topics: co-operatives, Co-operation, energy, energy co-operatives, privatisation, demutualisation, Southern...

The U.S. is about to repeat history again with respect to development and or intermittent deployment of its fifth national missile defense system. While the world and national politico military strategic environment are undergoing continuous change, the relevance of the arguments against National Missile Defense deployment remain strong and will effectively delay or thwart employment of even a limited national missile defense. In short, it is deja' vu. Given the increasingly austere DoD budget...

Topics: DTIC Archive, Kirby, Daniel R., ARMY WAR COLL CARLISLE BARRACKS PA, *BALLISTIC MISSILE INTERCEPT...

Under the support provided by ARO in the form of a MURI for Humanitiarian demining, successful techniques for discriminating between mines and anthropic clutter have been developed using a statistical signal processing approach. The improved performance provided by these algorithms has been validated using data obtained by DARPA. In order determine whether these algorithms have wider application than the relatively high-metallic content mines used in the DARPA experiment, the Joint UXO...

Topics: DTIC Archive, Collins, Leslie M., DUKE UNIV DURHAM NC, *SIGNAL PROCESSING, *LAND MINES, *MINE...